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the given callback for `event` or all\r\n * registered callbacks.\r\n *\r\n * @param {String} event\r\n * @param {Function} fn\r\n * @return {Emitter}\r\n * @api public\r\n */\r\n\r\nEmitter.prototype.off =\r\nEmitter.prototype.removeListener =\r\nEmitter.prototype.removeAllListeners =\r\nEmitter.prototype.removeEventListener = function(event, fn){\r\n this._callbacks = this._callbacks || {};\r\n\r\n // all\r\n if (0 == arguments.length) {\r\n this._callbacks = {};\r\n return this;\r\n }\r\n\r\n // specific event\r\n var callbacks = this._callbacks['$' + event];\r\n if (!callbacks) return this;\r\n\r\n // remove all handlers\r\n if (1 == arguments.length) {\r\n delete this._callbacks['$' + event];\r\n return this;\r\n }\r\n\r\n // remove specific handler\r\n var cb;\r\n for (var i = 0; i < callbacks.length; i++) {\r\n cb = callbacks[i];\r\n if (cb === fn || cb.fn === fn) {\r\n callbacks.splice(i, 1);\r\n break;\r\n }\r\n }\r\n\r\n // Remove event specific arrays for event types that no\r\n // one is subscribed for to avoid memory leak.\r\n if (callbacks.length === 0) {\r\n delete this._callbacks['$' + event];\r\n }\r\n\r\n return this;\r\n};\r\n\r\n/**\r\n * Emit `event` with the given args.\r\n *\r\n * @param {String} event\r\n * @param {Mixed} ...\r\n * @return {Emitter}\r\n */\r\n\r\nEmitter.prototype.emit = function(event){\r\n this._callbacks = this._callbacks || {};\r\n\r\n var args = new Array(arguments.length - 1)\r\n , callbacks = this._callbacks['$' + event];\r\n\r\n for (var i = 1; i < arguments.length; i++) {\r\n args[i - 1] = arguments[i];\r\n }\r\n\r\n if (callbacks) {\r\n callbacks = callbacks.slice(0);\r\n for (var i = 0, len = callbacks.length; i < len; ++i) {\r\n callbacks[i].apply(this, args);\r\n }\r\n }\r\n\r\n return this;\r\n};\r\n\r\n/**\r\n * Return array of callbacks for `event`.\r\n *\r\n * @param {String} event\r\n * @return {Array}\r\n * @api public\r\n */\r\n\r\nEmitter.prototype.listeners = function(event){\r\n this._callbacks = this._callbacks || {};\r\n return this._callbacks['$' + event] || [];\r\n};\r\n\r\n/**\r\n * Check if this emitter has `event` handlers.\r\n *\r\n * @param {String} event\r\n * @return {Boolean}\r\n * @api public\r\n */\r\n\r\nEmitter.prototype.hasListeners = function(event){\r\n return !! this.listeners(event).length;\r\n};\r\n","const encodePacket = require(\"./encodePacket\");\nconst decodePacket = require(\"./decodePacket\");\n\nconst SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text\n\nconst encodePayload = (packets, callback) => {\n // some packets may be added to the array while encoding, so the initial length must be saved\n const length = packets.length;\n const encodedPackets = new Array(length);\n let count = 0;\n\n packets.forEach((packet, i) => {\n // force base64 encoding for binary packets\n encodePacket(packet, false, encodedPacket => {\n encodedPackets[i] = encodedPacket;\n if (++count === length) {\n callback(encodedPackets.join(SEPARATOR));\n }\n });\n });\n};\n\nconst decodePayload = (encodedPayload, binaryType) => {\n const encodedPackets = encodedPayload.split(SEPARATOR);\n const packets = [];\n for (let i = 0; i < encodedPackets.length; i++) {\n const decodedPacket = decodePacket(encodedPackets[i], binaryType);\n packets.push(decodedPacket);\n if (decodedPacket.type === \"error\") {\n break;\n }\n }\n return packets;\n};\n\nmodule.exports = {\n protocol: 4,\n encodePacket,\n encodePayload,\n decodePacket,\n decodePayload\n};\n","module.exports = (() => {\n if (typeof self !== \"undefined\") {\n return self;\n } else if (typeof window !== \"undefined\") {\n return window;\n } else {\n return Function(\"return this\")();\n }\n})();\n","// browser shim for xmlhttprequest module\n\nconst hasCORS = require(\"has-cors\");\nconst globalThis = require(\"./globalThis\");\n\nmodule.exports = function(opts) {\n const xdomain = opts.xdomain;\n\n // scheme must be same when usign XDomainRequest\n // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx\n const xscheme = opts.xscheme;\n\n // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.\n // https://github.com/Automattic/engine.io-client/pull/217\n const enablesXDR = opts.enablesXDR;\n\n // XMLHttpRequest can be disabled on IE\n try {\n if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n return new XMLHttpRequest();\n }\n } catch (e) {}\n\n // Use XDomainRequest for IE8 if enablesXDR is true\n // because loading bar keeps flashing when using jsonp-polling\n // https://github.com/yujiosaka/socke.io-ie8-loading-example\n try {\n if (\"undefined\" !== typeof XDomainRequest && !xscheme && enablesXDR) {\n return new XDomainRequest();\n }\n } catch (e) {}\n\n if (!xdomain) {\n try {\n return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\n \"Microsoft.XMLHTTP\"\n );\n } catch (e) {}\n }\n};\n","const parser = require(\"engine.io-parser\");\nconst Emitter = require(\"component-emitter\");\n\nclass Transport extends Emitter {\n /**\n * Transport abstract constructor.\n *\n * @param {Object} options.\n * @api private\n */\n constructor(opts) {\n super();\n\n this.opts = opts;\n this.query = opts.query;\n this.readyState = \"\";\n this.socket = opts.socket;\n }\n\n /**\n * Emits an error.\n *\n * @param {String} str\n * @return {Transport} for chaining\n * @api public\n */\n onError(msg, desc) {\n const err = new Error(msg);\n err.type = \"TransportError\";\n err.description = desc;\n this.emit(\"error\", err);\n return this;\n }\n\n /**\n * Opens the transport.\n *\n * @api public\n */\n open() {\n if (\"closed\" === this.readyState || \"\" === this.readyState) {\n this.readyState = \"opening\";\n this.doOpen();\n }\n\n return this;\n }\n\n /**\n * Closes the transport.\n *\n * @api private\n */\n close() {\n if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n this.doClose();\n this.onClose();\n }\n\n return this;\n }\n\n /**\n * Sends multiple packets.\n *\n * @param {Array} packets\n * @api private\n */\n send(packets) {\n if (\"open\" === this.readyState) {\n this.write(packets);\n } else {\n throw new Error(\"Transport not open\");\n }\n }\n\n /**\n * Called upon open\n *\n * @api private\n */\n onOpen() {\n this.readyState = \"open\";\n this.writable = true;\n this.emit(\"open\");\n }\n\n /**\n * Called with data.\n *\n * @param {String} data\n * @api private\n */\n onData(data) {\n const packet = parser.decodePacket(data, this.socket.binaryType);\n this.onPacket(packet);\n }\n\n /**\n * Called with a decoded packet.\n */\n onPacket(packet) {\n this.emit(\"packet\", packet);\n }\n\n /**\n * Called upon close.\n *\n * @api private\n */\n onClose() {\n this.readyState = \"closed\";\n this.emit(\"close\");\n }\n}\n\nmodule.exports = Transport;\n","/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\n\nexports.encode = function (obj) {\n var str = '';\n\n for (var i in obj) {\n if (obj.hasOwnProperty(i)) {\n if (str.length) str += '&';\n str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n }\n }\n\n return str;\n};\n\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\n\nexports.decode = function(qs){\n var qry = {};\n var pairs = qs.split('&');\n for (var i = 0, l = pairs.length; i < l; i++) {\n var pair = pairs[i].split('=');\n qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n }\n return qry;\n};\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.Decoder = exports.Encoder = exports.PacketType = exports.protocol = void 0;\nconst Emitter = require(\"component-emitter\");\nconst binary_1 = require(\"./binary\");\nconst is_binary_1 = require(\"./is-binary\");\n\n\n/**\n * Protocol version.\n *\n * @public\n */\nexports.protocol = 5;\nvar PacketType;\n(function (PacketType) {\n PacketType[PacketType[\"CONNECT\"] = 0] = \"CONNECT\";\n PacketType[PacketType[\"DISCONNECT\"] = 1] = \"DISCONNECT\";\n PacketType[PacketType[\"EVENT\"] = 2] = \"EVENT\";\n PacketType[PacketType[\"ACK\"] = 3] = \"ACK\";\n PacketType[PacketType[\"CONNECT_ERROR\"] = 4] = \"CONNECT_ERROR\";\n PacketType[PacketType[\"BINARY_EVENT\"] = 5] = \"BINARY_EVENT\";\n PacketType[PacketType[\"BINARY_ACK\"] = 6] = \"BINARY_ACK\";\n})(PacketType = exports.PacketType || (exports.PacketType = {}));\n/**\n * A socket.io Encoder instance\n */\nclass Encoder {\n /**\n * Encode a packet as a single string if non-binary, or as a\n * buffer sequence, depending on packet type.\n *\n * @param {Object} obj - packet object\n */\n encode(obj) {\n\n\n if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {\n if (is_binary_1.hasBinary(obj)) {\n obj.type =\n obj.type === PacketType.EVENT\n ? PacketType.BINARY_EVENT\n : PacketType.BINARY_ACK;\n return this.encodeAsBinary(obj);\n }\n }\n return [this.encodeAsString(obj)];\n }\n /**\n * Encode packet as string.\n */\n encodeAsString(obj) {\n // first is type\n let str = \"\" + obj.type;\n // attachments if we have them\n if (obj.type === PacketType.BINARY_EVENT ||\n obj.type === PacketType.BINARY_ACK) {\n str += obj.attachments + \"-\";\n }\n // if we have a namespace other than `/`\n // we append it followed by a comma `,`\n if (obj.nsp && \"/\" !== obj.nsp) {\n str += obj.nsp + \",\";\n }\n // immediately followed by the id\n if (null != obj.id) {\n str += obj.id;\n }\n // json data\n if (null != obj.data) {\n str += JSON.stringify(obj.data);\n }\n\n\n return str;\n }\n /**\n * Encode packet as 'buffer sequence' by removing blobs, and\n * deconstructing packet into object with placeholders and\n * a list of buffers.\n */\n encodeAsBinary(obj) {\n const deconstruction = binary_1.deconstructPacket(obj);\n const pack = this.encodeAsString(deconstruction.packet);\n const buffers = deconstruction.buffers;\n buffers.unshift(pack); // add packet info to beginning of data list\n return buffers; // write all the buffers\n }\n}\nexports.Encoder = Encoder;\n/**\n * A socket.io Decoder instance\n *\n * @return {Object} decoder\n */\nclass Decoder extends Emitter {\n constructor() {\n super();\n }\n /**\n * Decodes an encoded packet string into packet JSON.\n *\n * @param {String} obj - encoded packet\n */\n add(obj) {\n let packet;\n if (typeof obj === \"string\") {\n packet = this.decodeString(obj);\n if (packet.type === PacketType.BINARY_EVENT ||\n packet.type === PacketType.BINARY_ACK) {\n // binary packet's json\n this.reconstructor = new BinaryReconstructor(packet);\n // no attachments, labeled binary but no binary data to follow\n if (packet.attachments === 0) {\n super.emit(\"decoded\", packet);\n }\n }\n else {\n // non-binary full packet\n super.emit(\"decoded\", packet);\n }\n }\n else if (is_binary_1.isBinary(obj) || obj.base64) {\n // raw binary data\n if (!this.reconstructor) {\n throw new Error(\"got binary data when not reconstructing a packet\");\n }\n else {\n packet = this.reconstructor.takeBinaryData(obj);\n if (packet) {\n // received final buffer\n this.reconstructor = null;\n super.emit(\"decoded\", packet);\n }\n }\n }\n else {\n throw new Error(\"Unknown type: \" + obj);\n }\n }\n /**\n * Decode a packet String (JSON data)\n *\n * @param {String} str\n * @return {Object} packet\n */\n decodeString(str) {\n let i = 0;\n // look up type\n const p = {\n type: Number(str.charAt(0)),\n };\n if (PacketType[p.type] === undefined) {\n throw new Error(\"unknown packet type \" + p.type);\n }\n // look up attachments if type binary\n if (p.type === PacketType.BINARY_EVENT ||\n p.type === PacketType.BINARY_ACK) {\n const start = i + 1;\n while (str.charAt(++i) !== \"-\" && i != str.length) { }\n const buf = str.substring(start, i);\n if (buf != Number(buf) || str.charAt(i) !== \"-\") {\n throw new Error(\"Illegal attachments\");\n }\n p.attachments = Number(buf);\n }\n // look up namespace (if any)\n if (\"/\" === str.charAt(i + 1)) {\n const start = i + 1;\n while (++i) {\n const c = str.charAt(i);\n if (\",\" === c)\n break;\n if (i === str.length)\n break;\n }\n p.nsp = str.substring(start, i);\n }\n else {\n p.nsp = \"/\";\n }\n // look up id\n const next = str.charAt(i + 1);\n if (\"\" !== next && Number(next) == next) {\n const start = i + 1;\n while (++i) {\n const c = str.charAt(i);\n if (null == c || Number(c) != c) {\n --i;\n break;\n }\n if (i === str.length)\n break;\n }\n p.id = Number(str.substring(start, i + 1));\n }\n // look up json data\n if (str.charAt(++i)) {\n const payload = tryParse(str.substr(i));\n if (Decoder.isPayloadValid(p.type, payload)) {\n p.data = payload;\n }\n else {\n throw new Error(\"invalid payload\");\n }\n }\n\n\n return p;\n }\n static isPayloadValid(type, payload) {\n switch (type) {\n case PacketType.CONNECT:\n return typeof payload === \"object\";\n case PacketType.DISCONNECT:\n return payload === undefined;\n case PacketType.CONNECT_ERROR:\n return typeof payload === \"string\" || typeof payload === \"object\";\n case PacketType.EVENT:\n case PacketType.BINARY_EVENT:\n return Array.isArray(payload) && typeof payload[0] === \"string\";\n case PacketType.ACK:\n case PacketType.BINARY_ACK:\n return Array.isArray(payload);\n }\n }\n /**\n * Deallocates a parser's resources\n */\n destroy() {\n if (this.reconstructor) {\n this.reconstructor.finishedReconstruction();\n }\n }\n}\nexports.Decoder = Decoder;\nfunction tryParse(str) {\n try {\n return JSON.parse(str);\n }\n catch (e) {\n return false;\n }\n}\n/**\n * A manager of a binary event's 'buffer sequence'. Should\n * be constructed whenever a packet of type BINARY_EVENT is\n * decoded.\n *\n * @param {Object} packet\n * @return {BinaryReconstructor} initialized reconstructor\n */\nclass BinaryReconstructor {\n constructor(packet) {\n this.packet = packet;\n this.buffers = [];\n this.reconPack = packet;\n }\n /**\n * Method to be called when binary data received from connection\n * after a BINARY_EVENT packet.\n *\n * @param {Buffer | ArrayBuffer} binData - the raw binary data received\n * @return {null | Object} returns null if more binary data is expected or\n * a reconstructed packet object if all buffers have been received.\n */\n takeBinaryData(binData) {\n this.buffers.push(binData);\n if (this.buffers.length === this.reconPack.attachments) {\n // done with buffer list\n const packet = binary_1.reconstructPacket(this.reconPack, this.buffers);\n this.finishedReconstruction();\n return packet;\n }\n return null;\n }\n /**\n * Cleans up binary packet reconstruction variables.\n */\n finishedReconstruction() {\n this.reconPack = null;\n this.buffers = [];\n }\n}\n","/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\n\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\n\nvar parts = [\n 'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'\n];\n\nmodule.exports = function parseuri(str) {\n var src = str,\n b = str.indexOf('['),\n e = str.indexOf(']');\n\n if (b != -1 && e != -1) {\n str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n }\n\n var m = re.exec(str || ''),\n uri = {},\n i = 14;\n\n while (i--) {\n uri[parts[i]] = m[i] || '';\n }\n\n if (b != -1 && e != -1) {\n uri.source = src;\n uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n uri.ipv6uri = true;\n }\n\n uri.pathNames = pathNames(uri, uri['path']);\n uri.queryKey = queryKey(uri, uri['query']);\n\n return uri;\n};\n\nfunction pathNames(obj, path) {\n var regx = /\\/{2,9}/g,\n names = path.replace(regx, \"/\").split(\"/\");\n\n if (path.substr(0, 1) == '/' || path.length === 0) {\n names.splice(0, 1);\n }\n if (path.substr(path.length - 1, 1) == '/') {\n names.splice(names.length - 1, 1);\n }\n\n return names;\n}\n\nfunction queryKey(uri, query) {\n var data = {};\n\n query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n if ($1) {\n data[$1] = $2;\n }\n });\n\n return data;\n}\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.Manager = void 0;\nconst eio = require(\"engine.io-client\");\nconst socket_1 = require(\"./socket\");\nconst Emitter = require(\"component-emitter\");\nconst parser = require(\"socket.io-parser\");\nconst on_1 = require(\"./on\");\nconst bind = require(\"component-bind\");\nconst Backoff = require(\"backo2\");\n\n\nclass Manager extends Emitter {\n constructor(uri, opts) {\n super();\n this.nsps = {};\n this.subs = [];\n this.connecting = [];\n if (uri && \"object\" === typeof uri) {\n opts = uri;\n uri = undefined;\n }\n opts = opts || {};\n opts.path = opts.path || \"/socket.io\";\n this.opts = opts;\n this.reconnection(opts.reconnection !== false);\n this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);\n this.reconnectionDelay(opts.reconnectionDelay || 1000);\n this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);\n this.randomizationFactor(opts.randomizationFactor || 0.5);\n this.backoff = new Backoff({\n min: this.reconnectionDelay(),\n max: this.reconnectionDelayMax(),\n jitter: this.randomizationFactor(),\n });\n this.timeout(null == opts.timeout ? 20000 : opts.timeout);\n this._readyState = \"closed\";\n this.uri = uri;\n const _parser = opts.parser || parser;\n this.encoder = new _parser.Encoder();\n this.decoder = new _parser.Decoder();\n this._autoConnect = opts.autoConnect !== false;\n if (this._autoConnect)\n this.open();\n }\n reconnection(v) {\n if (!arguments.length)\n return this._reconnection;\n this._reconnection = !!v;\n return this;\n }\n reconnectionAttempts(v) {\n if (v === undefined)\n return this._reconnectionAttempts;\n this._reconnectionAttempts = v;\n return this;\n }\n reconnectionDelay(v) {\n if (v === undefined)\n return this._reconnectionDelay;\n this._reconnectionDelay = v;\n this.backoff && this.backoff.setMin(v);\n return this;\n }\n randomizationFactor(v) {\n if (v === undefined)\n return this._randomizationFactor;\n this._randomizationFactor = v;\n this.backoff && this.backoff.setJitter(v);\n return this;\n }\n reconnectionDelayMax(v) {\n if (v === undefined)\n return this._reconnectionDelayMax;\n this._reconnectionDelayMax = v;\n this.backoff && this.backoff.setMax(v);\n return this;\n }\n timeout(v) {\n if (!arguments.length)\n return this._timeout;\n this._timeout = v;\n return this;\n }\n /**\n * Starts trying to reconnect if reconnection is enabled and we have not\n * started reconnecting yet\n *\n * @private\n */\n maybeReconnectOnOpen() {\n // Only try to reconnect if it's the first time we're connecting\n if (!this._reconnecting &&\n this._reconnection &&\n this.backoff.attempts === 0) {\n // keeps reconnection from firing twice for the same reconnection loop\n this.reconnect();\n }\n }\n /**\n * Sets the current transport `socket`.\n *\n * @param {Function} fn - optional, callback\n * @return {Manager} self\n * @public\n */\n open(fn) {\n\n\n if (~this._readyState.indexOf(\"open\"))\n return this;\n\n\n this.engine = eio(this.uri, this.opts);\n const socket = this.engine;\n const self = this;\n this._readyState = \"opening\";\n this.skipReconnect = false;\n // emit `open`\n const openSub = on_1.on(socket, \"open\", function () {\n self.onopen();\n fn && fn();\n });\n // emit `error`\n const errorSub = on_1.on(socket, \"error\", (err) => {\n\n\n self.cleanup();\n self._readyState = \"closed\";\n super.emit(\"error\", err);\n if (fn) {\n fn(err);\n }\n else {\n // Only do this if there is no fn to handle the error\n self.maybeReconnectOnOpen();\n }\n });\n if (false !== this._timeout) {\n const timeout = this._timeout;\n\n\n if (timeout === 0) {\n openSub.destroy(); // prevents a race condition with the 'open' event\n }\n // set timer\n const timer = setTimeout(() => {\n\n\n openSub.destroy();\n socket.close();\n socket.emit(\"error\", new Error(\"timeout\"));\n }, timeout);\n this.subs.push({\n destroy: function () {\n clearTimeout(timer);\n },\n });\n }\n this.subs.push(openSub);\n this.subs.push(errorSub);\n return this;\n }\n /**\n * Alias for open()\n *\n * @return {Manager} self\n * @public\n */\n connect(fn) {\n return this.open(fn);\n }\n /**\n * Called upon transport open.\n *\n * @private\n */\n onopen() {\n\n\n // clear old subs\n this.cleanup();\n // mark as open\n this._readyState = \"open\";\n super.emit(\"open\");\n // add new subs\n const socket = this.engine;\n this.subs.push(on_1.on(socket, \"data\", bind(this, \"ondata\")));\n this.subs.push(on_1.on(socket, \"ping\", bind(this, \"onping\")));\n this.subs.push(on_1.on(socket, \"error\", bind(this, \"onerror\")));\n this.subs.push(on_1.on(socket, \"close\", bind(this, \"onclose\")));\n this.subs.push(on_1.on(this.decoder, \"decoded\", bind(this, \"ondecoded\")));\n }\n /**\n * Called upon a ping.\n *\n * @private\n */\n onping() {\n super.emit(\"ping\");\n }\n /**\n * Called with data.\n *\n * @private\n */\n ondata(data) {\n this.decoder.add(data);\n }\n /**\n * Called when parser fully decodes a packet.\n *\n * @private\n */\n ondecoded(packet) {\n super.emit(\"packet\", packet);\n }\n /**\n * Called upon socket error.\n *\n * @private\n */\n onerror(err) {\n\n\n super.emit(\"error\", err);\n }\n /**\n * Creates a new socket for the given `nsp`.\n *\n * @return {Socket}\n * @public\n */\n socket(nsp, opts) {\n let socket = this.nsps[nsp];\n if (!socket) {\n socket = new socket_1.Socket(this, nsp, opts);\n this.nsps[nsp] = socket;\n var self = this;\n socket.on(\"connecting\", onConnecting);\n if (this._autoConnect) {\n // manually call here since connecting event is fired before listening\n onConnecting();\n }\n }\n function onConnecting() {\n if (!~self.connecting.indexOf(socket)) {\n self.connecting.push(socket);\n }\n }\n return socket;\n }\n /**\n * Called upon a socket close.\n *\n * @param {Socket} socket\n * @private\n */\n _destroy(socket) {\n const index = this.connecting.indexOf(socket);\n if (~index)\n this.connecting.splice(index, 1);\n if (this.connecting.length)\n return;\n this._close();\n }\n /**\n * Writes a packet.\n *\n * @param {Object} packet\n * @private\n */\n _packet(packet) {\n\n\n if (packet.query && packet.type === 0)\n packet.nsp += \"?\" + packet.query;\n const encodedPackets = this.encoder.encode(packet);\n for (let i = 0; i < encodedPackets.length; i++) {\n this.engine.write(encodedPackets[i], packet.options);\n }\n }\n /**\n * Clean up transport subscriptions and packet buffer.\n *\n * @private\n */\n cleanup() {\n\n\n const subsLength = this.subs.length;\n for (let i = 0; i < subsLength; i++) {\n const sub = this.subs.shift();\n sub.destroy();\n }\n this.decoder.destroy();\n }\n /**\n * Close the current socket.\n *\n * @private\n */\n _close() {\n\n\n this.skipReconnect = true;\n this._reconnecting = false;\n if (\"opening\" === this._readyState) {\n // `onclose` will not fire because\n // an open event never happened\n this.cleanup();\n }\n this.backoff.reset();\n this._readyState = \"closed\";\n if (this.engine)\n this.engine.close();\n }\n /**\n * Alias for close()\n *\n * @private\n */\n disconnect() {\n return this._close();\n }\n /**\n * Called upon engine close.\n *\n * @private\n */\n onclose(reason) {\n\n\n this.cleanup();\n this.backoff.reset();\n this._readyState = \"closed\";\n super.emit(\"close\", reason);\n if (this._reconnection && !this.skipReconnect) {\n this.reconnect();\n }\n }\n /**\n * Attempt a reconnection.\n *\n * @private\n */\n reconnect() {\n if (this._reconnecting || this.skipReconnect)\n return this;\n const self = this;\n if (this.backoff.attempts >= this._reconnectionAttempts) {\n\n\n this.backoff.reset();\n super.emit(\"reconnect_failed\");\n this._reconnecting = false;\n }\n else {\n const delay = this.backoff.duration();\n\n\n this._reconnecting = true;\n const timer = setTimeout(() => {\n if (self.skipReconnect)\n return;\n\n\n super.emit(\"reconnect_attempt\", self.backoff.attempts);\n // check again for the case socket closed in above events\n if (self.skipReconnect)\n return;\n self.open((err) => {\n if (err) {\n\n\n self._reconnecting = false;\n self.reconnect();\n super.emit(\"reconnect_error\", err);\n }\n else {\n\n\n self.onreconnect();\n }\n });\n }, delay);\n this.subs.push({\n destroy: function () {\n clearTimeout(timer);\n },\n });\n }\n }\n /**\n * Called upon successful reconnect.\n *\n * @private\n */\n onreconnect() {\n const attempt = this.backoff.attempts;\n this._reconnecting = false;\n this.backoff.reset();\n super.emit(\"reconnect\", attempt);\n }\n}\nexports.Manager = Manager;\n","const XMLHttpRequest = require(\"xmlhttprequest-ssl\");\nconst XHR = require(\"./polling-xhr\");\nconst JSONP = require(\"./polling-jsonp\");\nconst websocket = require(\"./websocket\");\n\nexports.polling = polling;\nexports.websocket = websocket;\n\n/**\n * Polling transport polymorphic constructor.\n * Decides on xhr vs jsonp based on feature detection.\n *\n * @api private\n */\n\nfunction polling(opts) {\n let xhr;\n let xd = false;\n let xs = false;\n const jsonp = false !== opts.jsonp;\n\n if (typeof location !== \"undefined\") {\n const isSSL = \"https:\" === location.protocol;\n let port = location.port;\n\n // some user agents have empty `location.port`\n if (!port) {\n port = isSSL ? 443 : 80;\n }\n\n xd = opts.hostname !== location.hostname || port !== opts.port;\n xs = opts.secure !== isSSL;\n }\n\n opts.xdomain = xd;\n opts.xscheme = xs;\n xhr = new XMLHttpRequest(opts);\n\n if (\"open\" in xhr && !opts.forceJSONP) {\n return new XHR(opts);\n } else {\n if (!jsonp) throw new Error(\"JSONP disabled\");\n return new JSONP(opts);\n }\n}\n","const Transport = require(\"../transport\");\nconst parseqs = require(\"parseqs\");\nconst parser = require(\"engine.io-parser\");\nconst yeast = require(\"yeast\");\n\n\n\n\nclass Polling extends Transport {\n /**\n * Transport name.\n */\n get name() {\n return \"polling\";\n }\n\n /**\n * Opens the socket (triggers polling). We write a PING message to determine\n * when the transport is open.\n *\n * @api private\n */\n doOpen() {\n this.poll();\n }\n\n /**\n * Pauses polling.\n *\n * @param {Function} callback upon buffers are flushed and transport is paused\n * @api private\n */\n pause(onPause) {\n const self = this;\n\n this.readyState = \"pausing\";\n\n function pause() {\n\n\n self.readyState = \"paused\";\n onPause();\n }\n\n if (this.polling || !this.writable) {\n let total = 0;\n\n if (this.polling) {\n\n\n total++;\n this.once(\"pollComplete\", function() {\n\n\n --total || pause();\n });\n }\n\n if (!this.writable) {\n\n\n total++;\n this.once(\"drain\", function() {\n\n\n --total || pause();\n });\n }\n } else {\n pause();\n }\n }\n\n /**\n * Starts polling cycle.\n *\n * @api public\n */\n poll() {\n\n\n this.polling = true;\n this.doPoll();\n this.emit(\"poll\");\n }\n\n /**\n * Overloads onData to detect payloads.\n *\n * @api private\n */\n onData(data) {\n const self = this;\n\n\n const callback = function(packet, index, total) {\n // if its the first message we consider the transport open\n if (\"opening\" === self.readyState && packet.type === \"open\") {\n self.onOpen();\n }\n\n // if its a close packet, we close the ongoing requests\n if (\"close\" === packet.type) {\n self.onClose();\n return false;\n }\n\n // otherwise bypass onData and handle the message\n self.onPacket(packet);\n };\n\n // decode payload\n parser.decodePayload(data, this.socket.binaryType).forEach(callback);\n\n // if an event did not trigger closing\n if (\"closed\" !== this.readyState) {\n // if we got data we're not polling\n this.polling = false;\n this.emit(\"pollComplete\");\n\n if (\"open\" === this.readyState) {\n this.poll();\n } else {\n\n\n }\n }\n }\n\n /**\n * For polling, send a close packet.\n *\n * @api private\n */\n doClose() {\n const self = this;\n\n function close() {\n\n\n self.write([{ type: \"close\" }]);\n }\n\n if (\"open\" === this.readyState) {\n\n\n close();\n } else {\n // in case we're trying to close while\n // handshaking is in progress (GH-164)\n\n\n this.once(\"open\", close);\n }\n }\n\n /**\n * Writes a packets payload.\n *\n * @param {Array} data packets\n * @param {Function} drain callback\n * @api private\n */\n write(packets) {\n this.writable = false;\n\n parser.encodePayload(packets, data => {\n this.doWrite(data, () => {\n this.writable = true;\n this.emit(\"drain\");\n });\n });\n }\n\n /**\n * Generates uri for connection.\n *\n * @api private\n */\n uri() {\n let query = this.query || {};\n const schema = this.opts.secure ? \"https\" : \"http\";\n let port = \"\";\n\n // cache busting is forced\n if (false !== this.opts.timestampRequests) {\n query[this.opts.timestampParam] = yeast();\n }\n\n if (!this.supportsBinary && !query.sid) {\n query.b64 = 1;\n }\n\n query = parseqs.encode(query);\n\n // avoid port if default for schema\n if (\n this.opts.port &&\n ((\"https\" === schema && Number(this.opts.port) !== 443) ||\n (\"http\" === schema && Number(this.opts.port) !== 80))\n ) {\n port = \":\" + this.opts.port;\n }\n\n // prepend ? to query\n if (query.length) {\n query = \"?\" + query;\n }\n\n const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n return (\n schema +\n \"://\" +\n (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n port +\n this.opts.path +\n query\n );\n }\n}\n\nmodule.exports = Polling;\n","const PACKET_TYPES = Object.create(null); // no Map = no polyfill\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\n\nconst PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(key => {\n PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\n\nconst ERROR_PACKET = { type: \"error\", data: \"parser error\" };\n\nmodule.exports = {\n PACKET_TYPES,\n PACKET_TYPES_REVERSE,\n ERROR_PACKET\n};\n","'use strict';\n\nvar alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')\n , length = 64\n , map = {}\n , seed = 0\n , i = 0\n , prev;\n\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\nfunction encode(num) {\n var encoded = '';\n\n do {\n encoded = alphabet[num % length] + encoded;\n num = Math.floor(num / length);\n } while (num > 0);\n\n return encoded;\n}\n\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\nfunction decode(str) {\n var decoded = 0;\n\n for (i = 0; i < str.length; i++) {\n decoded = decoded * length + map[str.charAt(i)];\n }\n\n return decoded;\n}\n\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\nfunction yeast() {\n var now = encode(+new Date());\n\n if (now !== prev) return seed = 0, prev = now;\n return now +'.'+ encode(seed++);\n}\n\n//\n// Map each character to its index.\n//\nfor (; i < length; i++) map[alphabet[i]] = i;\n\n//\n// Expose the `yeast`, `encode` and `decode` functions.\n//\nyeast.encode = encode;\nyeast.decode = decode;\nmodule.exports = yeast;\n","module.exports.pick = (obj, ...attr) => {\n return attr.reduce((acc, k) => {\n acc[k] = obj[k];\n return acc;\n }, {});\n};\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.Socket = void 0;\nconst socket_io_parser_1 = require(\"socket.io-parser\");\nconst Emitter = require(\"component-emitter\");\nconst on_1 = require(\"./on\");\nconst bind = require(\"component-bind\");\n\n\n/**\n * Internal events.\n * These events can't be emitted by the user.\n */\nconst RESERVED_EVENTS = {\n connect: 1,\n connect_error: 1,\n disconnect: 1,\n disconnecting: 1,\n // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener\n newListener: 1,\n removeListener: 1,\n};\nclass Socket extends Emitter {\n /**\n * `Socket` constructor.\n *\n * @public\n */\n constructor(io, nsp, opts) {\n super();\n this.ids = 0;\n this.acks = {};\n this.receiveBuffer = [];\n this.sendBuffer = [];\n this.flags = {};\n this.io = io;\n this.nsp = nsp;\n this.ids = 0;\n this.acks = {};\n this.receiveBuffer = [];\n this.sendBuffer = [];\n this.connected = false;\n this.disconnected = true;\n this.flags = {};\n if (opts && opts.auth) {\n this.auth = opts.auth;\n }\n if (this.io._autoConnect)\n this.open();\n }\n /**\n * Subscribe to open, close and packet events\n *\n * @private\n */\n subEvents() {\n if (this.subs)\n return;\n const io = this.io;\n this.subs = [\n on_1.on(io, \"open\", bind(this, \"onopen\")),\n on_1.on(io, \"packet\", bind(this, \"onpacket\")),\n on_1.on(io, \"close\", bind(this, \"onclose\")),\n ];\n }\n /**\n * \"Opens\" the socket.\n *\n * @public\n */\n connect() {\n if (this.connected)\n return this;\n this.subEvents();\n if (!this.io._reconnecting)\n this.io.open(); // ensure open\n if (\"open\" === this.io._readyState)\n this.onopen();\n return this;\n }\n /**\n * Alias for connect()\n */\n open() {\n return this.connect();\n }\n /**\n * Sends a `message` event.\n *\n * @return {Socket} self\n * @public\n */\n send(...args) {\n args.unshift(\"message\");\n this.emit.apply(this, args);\n return this;\n }\n /**\n * Override `emit`.\n * If the event is in `events`, it's emitted normally.\n *\n * @param {String} ev - event name\n * @return {Socket} self\n * @public\n */\n emit(ev, ...args) {\n if (RESERVED_EVENTS.hasOwnProperty(ev)) {\n throw new Error('\"' + ev + '\" is a reserved event name');\n }\n args.unshift(ev);\n const packet = {\n type: socket_io_parser_1.PacketType.EVENT,\n data: args,\n };\n packet.options = {};\n packet.options.compress = this.flags.compress !== false;\n // event ack callback\n if (\"function\" === typeof args[args.length - 1]) {\n\n\n this.acks[this.ids] = args.pop();\n packet.id = this.ids++;\n }\n const isTransportWritable = this.io.engine &&\n this.io.engine.transport &&\n this.io.engine.transport.writable;\n const discardPacket = this.flags.volatile && (!isTransportWritable || !this.connected);\n if (discardPacket) {\n\n\n }\n else if (this.connected) {\n this.packet(packet);\n }\n else {\n this.sendBuffer.push(packet);\n }\n this.flags = {};\n return this;\n }\n /**\n * Sends a packet.\n *\n * @param {Object} packet\n * @private\n */\n packet(packet) {\n packet.nsp = this.nsp;\n this.io._packet(packet);\n }\n /**\n * Called upon engine `open`.\n *\n * @private\n */\n onopen() {\n\n\n if (typeof this.auth == \"function\") {\n this.auth((data) => {\n this.packet({ type: socket_io_parser_1.PacketType.CONNECT, data });\n });\n }\n else {\n this.packet({ type: socket_io_parser_1.PacketType.CONNECT, data: this.auth });\n }\n }\n /**\n * Called upon engine `close`.\n *\n * @param {String} reason\n * @private\n */\n onclose(reason) {\n\n\n this.connected = false;\n this.disconnected = true;\n delete this.id;\n super.emit(\"disconnect\", reason);\n }\n /**\n * Called with socket packet.\n *\n * @param {Object} packet\n * @private\n */\n onpacket(packet) {\n const sameNamespace = packet.nsp === this.nsp;\n if (!sameNamespace)\n return;\n switch (packet.type) {\n case socket_io_parser_1.PacketType.CONNECT:\n const id = packet.data.sid;\n this.onconnect(id);\n break;\n case socket_io_parser_1.PacketType.EVENT:\n this.onevent(packet);\n break;\n case socket_io_parser_1.PacketType.BINARY_EVENT:\n this.onevent(packet);\n break;\n case socket_io_parser_1.PacketType.ACK:\n this.onack(packet);\n break;\n case socket_io_parser_1.PacketType.BINARY_ACK:\n this.onack(packet);\n break;\n case socket_io_parser_1.PacketType.DISCONNECT:\n this.ondisconnect();\n break;\n case socket_io_parser_1.PacketType.CONNECT_ERROR:\n const err = new Error(packet.data.message);\n // @ts-ignore\n err.data = packet.data.data;\n super.emit(\"connect_error\", err);\n break;\n }\n }\n /**\n * Called upon a server event.\n *\n * @param {Object} packet\n * @private\n */\n onevent(packet) {\n const args = packet.data || [];\n\n\n if (null != packet.id) {\n\n\n args.push(this.ack(packet.id));\n }\n if (this.connected) {\n this.emitEvent(args);\n }\n else {\n this.receiveBuffer.push(args);\n }\n }\n emitEvent(args) {\n if (this._anyListeners && this._anyListeners.length) {\n const listeners = this._anyListeners.slice();\n for (const listener of listeners) {\n listener.apply(this, args);\n }\n }\n super.emit.apply(this, args);\n }\n /**\n * Produces an ack callback to emit with an event.\n *\n * @private\n */\n ack(id) {\n const self = this;\n let sent = false;\n return function (...args) {\n // prevent double callbacks\n if (sent)\n return;\n sent = true;\n\n\n self.packet({\n type: socket_io_parser_1.PacketType.ACK,\n id: id,\n data: args,\n });\n };\n }\n /**\n * Called upon a server acknowlegement.\n *\n * @param {Object} packet\n * @private\n */\n onack(packet) {\n const ack = this.acks[packet.id];\n if (\"function\" === typeof ack) {\n\n\n ack.apply(this, packet.data);\n delete this.acks[packet.id];\n }\n else {\n\n\n }\n }\n /**\n * Called upon server connect.\n *\n * @private\n */\n onconnect(id) {\n this.id = id;\n this.connected = true;\n this.disconnected = false;\n super.emit(\"connect\");\n this.emitBuffered();\n }\n /**\n * Emit buffered events (received and emitted).\n *\n * @private\n */\n emitBuffered() {\n for (let i = 0; i < this.receiveBuffer.length; i++) {\n this.emitEvent(this.receiveBuffer[i]);\n }\n this.receiveBuffer = [];\n for (let i = 0; i < this.sendBuffer.length; i++) {\n this.packet(this.sendBuffer[i]);\n }\n this.sendBuffer = [];\n }\n /**\n * Called upon server disconnect.\n *\n * @private\n */\n ondisconnect() {\n\n\n this.destroy();\n this.onclose(\"io server disconnect\");\n }\n /**\n * Called upon forced client/server side disconnections,\n * this method ensures the manager stops tracking us and\n * that reconnections don't get triggered for this.\n *\n * @private\n */\n destroy() {\n if (this.subs) {\n // clean subscriptions to avoid reconnections\n for (let i = 0; i < this.subs.length; i++) {\n this.subs[i].destroy();\n }\n this.subs = null;\n }\n this.io._destroy(this);\n }\n /**\n * Disconnects the socket manually.\n *\n * @return {Socket} self\n * @public\n */\n disconnect() {\n if (this.connected) {\n\n\n this.packet({ type: socket_io_parser_1.PacketType.DISCONNECT });\n }\n // remove socket from pool\n this.destroy();\n if (this.connected) {\n // fire events\n this.onclose(\"io client disconnect\");\n }\n return this;\n }\n /**\n * Alias for disconnect()\n *\n * @return {Socket} self\n * @public\n */\n close() {\n return this.disconnect();\n }\n /**\n * Sets the compress flag.\n *\n * @param {Boolean} compress - if `true`, compresses the sending data\n * @return {Socket} self\n * @public\n */\n compress(compress) {\n this.flags.compress = compress;\n return this;\n }\n /**\n * Sets a modifier for a subsequent event emission that the event message will be dropped when this socket is not\n * ready to send messages.\n *\n * @returns {Socket} self\n * @public\n */\n get volatile() {\n this.flags.volatile = true;\n return this;\n }\n /**\n * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n * callback.\n *\n * @param listener\n * @public\n */\n onAny(listener) {\n this._anyListeners = this._anyListeners || [];\n this._anyListeners.push(listener);\n return this;\n }\n /**\n * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n * callback. The listener is added to the beginning of the listeners array.\n *\n * @param listener\n * @public\n */\n prependAny(listener) {\n this._anyListeners = this._anyListeners || [];\n this._anyListeners.unshift(listener);\n return this;\n }\n /**\n * Removes the listener that will be fired when any event is emitted.\n *\n * @param listener\n * @public\n */\n offAny(listener) {\n if (!this._anyListeners) {\n return this;\n }\n if (listener) {\n const listeners = this._anyListeners;\n for (let i = 0; i < listeners.length; i++) {\n if (listener === listeners[i]) {\n listeners.splice(i, 1);\n return this;\n }\n }\n }\n else {\n this._anyListeners = [];\n }\n return this;\n }\n /**\n * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,\n * e.g. to remove listeners.\n *\n * @public\n */\n listenersAny() {\n return this._anyListeners || [];\n }\n}\nexports.Socket = Socket;\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.hasBinary = exports.isBinary = void 0;\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst isView = (obj) => {\n return typeof ArrayBuffer.isView === \"function\"\n ? ArrayBuffer.isView(obj)\n : obj.buffer instanceof ArrayBuffer;\n};\nconst toString = Object.prototype.toString;\nconst withNativeBlob = typeof Blob === \"function\" ||\n (typeof Blob !== \"undefined\" &&\n toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeFile = typeof File === \"function\" ||\n (typeof File !== \"undefined\" &&\n toString.call(File) === \"[object FileConstructor]\");\n/**\n * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.\n *\n * @private\n */\nfunction isBinary(obj) {\n return ((withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj))) ||\n (withNativeBlob && obj instanceof Blob) ||\n (withNativeFile && obj instanceof File));\n}\nexports.isBinary = isBinary;\nfunction hasBinary(obj, toJSON) {\n if (!obj || typeof obj !== \"object\") {\n return false;\n }\n if (Array.isArray(obj)) {\n for (let i = 0, l = obj.length; i < l; i++) {\n if (hasBinary(obj[i])) {\n return true;\n }\n }\n return false;\n }\n if (isBinary(obj)) {\n return true;\n }\n if (obj.toJSON &&\n typeof obj.toJSON === \"function\" &&\n arguments.length === 1) {\n return hasBinary(obj.toJSON(), true);\n }\n for (const key in obj) {\n if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {\n return true;\n }\n }\n return false;\n}\nexports.hasBinary = hasBinary;\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.on = void 0;\nfunction on(obj, ev, fn) {\n obj.on(ev, fn);\n return {\n destroy: function () {\n obj.removeListener(ev, fn);\n },\n };\n}\nexports.on = on;\n","/**\n * Slice reference.\n */\n\nvar slice = [].slice;\n\n/**\n * Bind `obj` to `fn`.\n *\n * @param {Object} obj\n * @param {Function|String} fn or string\n * @return {Function}\n * @api public\n */\n\nmodule.exports = function(obj, fn){\n if ('string' == typeof fn) fn = obj[fn];\n if ('function' != typeof fn) throw new Error('bind() requires a function');\n var args = slice.call(arguments, 2);\n return function(){\n return fn.apply(obj, args.concat(slice.call(arguments)));\n }\n};\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.Socket = exports.io = exports.Manager = exports.protocol = void 0;\nconst url_1 = require(\"./url\");\nconst manager_1 = require(\"./manager\");\nconst socket_1 = require(\"./socket\");\nObject.defineProperty(exports, \"Socket\", { enumerable: true, get: function () { return socket_1.Socket; } });\n\n\n/**\n * Module exports.\n */\nmodule.exports = exports = lookup;\n/**\n * Managers cache.\n */\nconst cache = (exports.managers = {});\nfunction lookup(uri, opts) {\n if (typeof uri === \"object\") {\n opts = uri;\n uri = undefined;\n }\n opts = opts || {};\n const parsed = url_1.url(uri);\n const source = parsed.source;\n const id = parsed.id;\n const path = parsed.path;\n const sameNamespace = cache[id] && path in cache[id].nsps;\n const newConnection = opts.forceNew ||\n opts[\"force new connection\"] ||\n false === opts.multiplex ||\n sameNamespace;\n let io;\n if (newConnection) {\n\n\n io = new manager_1.Manager(source, opts);\n }\n else {\n if (!cache[id]) {\n\n\n cache[id] = new manager_1.Manager(source, opts);\n }\n io = cache[id];\n }\n if (parsed.query && !opts.query) {\n opts.query = parsed.query;\n }\n return io.socket(parsed.path, opts);\n}\nexports.io = lookup;\n/**\n * Protocol version.\n *\n * @public\n */\nvar socket_io_parser_1 = require(\"socket.io-parser\");\nObject.defineProperty(exports, \"protocol\", { enumerable: true, get: function () { return socket_io_parser_1.protocol; } });\n/**\n * `connect`.\n *\n * @param {String} uri\n * @public\n */\nexports.connect = lookup;\n/**\n * Expose constructors for standalone build.\n *\n * @public\n */\nvar manager_2 = require(\"./manager\");\nObject.defineProperty(exports, \"Manager\", { enumerable: true, get: function () { return manager_2.Manager; } });\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.url = void 0;\nconst parseuri = require(\"parseuri\");\n\n\n/**\n * URL parser.\n *\n * @param {String} uri - url\n * @param {Object} loc - An object meant to mimic window.location.\n * Defaults to window.location.\n * @public\n */\nfunction url(uri, loc) {\n let obj = uri;\n // default to window.location\n loc = loc || (typeof location !== \"undefined\" && location);\n if (null == uri)\n uri = loc.protocol + \"//\" + loc.host;\n // relative path support\n if (\"string\" === typeof uri) {\n if (\"/\" === uri.charAt(0)) {\n if (\"/\" === uri.charAt(1)) {\n uri = loc.protocol + uri;\n }\n else {\n uri = loc.host + uri;\n }\n }\n if (!/^(https?|wss?):\\/\\//.test(uri)) {\n\n\n if (\"undefined\" !== typeof loc) {\n uri = loc.protocol + \"//\" + uri;\n }\n else {\n uri = \"https://\" + uri;\n }\n }\n // parse\n\n\n obj = parseuri(uri);\n }\n // make sure we treat `localhost:80` and `localhost` equally\n if (!obj.port) {\n if (/^(http|ws)$/.test(obj.protocol)) {\n obj.port = \"80\";\n }\n else if (/^(http|ws)s$/.test(obj.protocol)) {\n obj.port = \"443\";\n }\n }\n obj.path = obj.path || \"/\";\n const ipv6 = obj.host.indexOf(\":\") !== -1;\n const host = ipv6 ? \"[\" + obj.host + \"]\" : obj.host;\n // define unique id\n obj.id = obj.protocol + \"://\" + host + \":\" + obj.port;\n // define href\n obj.href =\n obj.protocol +\n \"://\" +\n host +\n (loc && loc.port === obj.port ? \"\" : \":\" + obj.port);\n return obj;\n}\nexports.url = url;\n","const Socket = require(\"./socket\");\n\nmodule.exports = (uri, opts) => new Socket(uri, opts);\n\n/**\n * Expose deps for legacy compatibility\n * and standalone browser access.\n */\n\nmodule.exports.Socket = Socket;\nmodule.exports.protocol = Socket.protocol; // this is an int\nmodule.exports.Transport = require(\"./transport\");\nmodule.exports.transports = require(\"./transports/index\");\nmodule.exports.parser = require(\"engine.io-parser\");\n","const transports = require(\"./transports/index\");\nconst Emitter = require(\"component-emitter\");\n\n\nconst parser = require(\"engine.io-parser\");\nconst parseuri = require(\"parseuri\");\nconst parseqs = require(\"parseqs\");\n\nclass Socket extends Emitter {\n /**\n * Socket constructor.\n *\n * @param {String|Object} uri or options\n * @param {Object} options\n * @api public\n */\n constructor(uri, opts = {}) {\n super();\n\n if (uri && \"object\" === typeof uri) {\n opts = uri;\n uri = null;\n }\n\n if (uri) {\n uri = parseuri(uri);\n opts.hostname = uri.host;\n opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n opts.port = uri.port;\n if (uri.query) opts.query = uri.query;\n } else if (opts.host) {\n opts.hostname = parseuri(opts.host).host;\n }\n\n this.secure =\n null != opts.secure\n ? opts.secure\n : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n\n if (opts.hostname && !opts.port) {\n // if no port is specified manually, use the protocol default\n opts.port = this.secure ? \"443\" : \"80\";\n }\n\n this.hostname =\n opts.hostname ||\n (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n this.port =\n opts.port ||\n (typeof location !== \"undefined\" && location.port\n ? location.port\n : this.secure\n ? 443\n : 80);\n\n this.transports = opts.transports || [\"polling\", \"websocket\"];\n this.readyState = \"\";\n this.writeBuffer = [];\n this.prevBufferLen = 0;\n\n this.opts = Object.assign(\n {\n path: \"/engine.io\",\n agent: false,\n withCredentials: false,\n upgrade: true,\n jsonp: true,\n timestampParam: \"t\",\n policyPort: 843,\n rememberUpgrade: false,\n rejectUnauthorized: true,\n perMessageDeflate: {\n threshold: 1024\n },\n transportOptions: {}\n },\n opts\n );\n\n this.opts.path = this.opts.path.replace(/\\/$/, \"\") + \"/\";\n\n if (typeof this.opts.query === \"string\") {\n this.opts.query = parseqs.decode(this.opts.query);\n }\n\n // set on handshake\n this.id = null;\n this.upgrades = null;\n this.pingInterval = null;\n this.pingTimeout = null;\n\n // set on heartbeat\n this.pingTimeoutTimer = null;\n\n this.open();\n }\n\n /**\n * Creates transport of the given type.\n *\n * @param {String} transport name\n * @return {Transport}\n * @api private\n */\n createTransport(name) {\n\n\n const query = clone(this.opts.query);\n\n // append engine.io protocol identifier\n query.EIO = parser.protocol;\n\n // transport name\n query.transport = name;\n\n // session id if we already have one\n if (this.id) query.sid = this.id;\n\n const opts = Object.assign(\n {},\n this.opts.transportOptions[name],\n this.opts,\n {\n query,\n socket: this,\n hostname: this.hostname,\n secure: this.secure,\n port: this.port\n }\n );\n\n\n\n\n return new transports[name](opts);\n }\n\n /**\n * Initializes transport to use and starts probe.\n *\n * @api private\n */\n open() {\n let transport;\n if (\n this.opts.rememberUpgrade &&\n Socket.priorWebsocketSuccess &&\n this.transports.indexOf(\"websocket\") !== -1\n ) {\n transport = \"websocket\";\n } else if (0 === this.transports.length) {\n // Emit error on next tick so it can be listened to\n const self = this;\n setTimeout(function() {\n self.emit(\"error\", \"No transports available\");\n }, 0);\n return;\n } else {\n transport = this.transports[0];\n }\n this.readyState = \"opening\";\n\n // Retry with the next transport if the transport is disabled (jsonp: false)\n try {\n transport = this.createTransport(transport);\n } catch (e) {\n\n\n this.transports.shift();\n this.open();\n return;\n }\n\n transport.open();\n this.setTransport(transport);\n }\n\n /**\n * Sets the current transport. Disables the existing one (if any).\n *\n * @api private\n */\n setTransport(transport) {\n\n\n const self = this;\n\n if (this.transport) {\n\n\n this.transport.removeAllListeners();\n }\n\n // set up transport\n this.transport = transport;\n\n // set up transport listeners\n transport\n .on(\"drain\", function() {\n self.onDrain();\n })\n .on(\"packet\", function(packet) {\n self.onPacket(packet);\n })\n .on(\"error\", function(e) {\n self.onError(e);\n })\n .on(\"close\", function() {\n self.onClose(\"transport close\");\n });\n }\n\n /**\n * Probes a transport.\n *\n * @param {String} transport name\n * @api private\n */\n probe(name) {\n\n\n let transport = this.createTransport(name, { probe: 1 });\n let failed = false;\n const self = this;\n\n Socket.priorWebsocketSuccess = false;\n\n function onTransportOpen() {\n if (self.onlyBinaryUpgrades) {\n const upgradeLosesBinary =\n !this.supportsBinary && self.transport.supportsBinary;\n failed = failed || upgradeLosesBinary;\n }\n if (failed) return;\n\n\n\n transport.send([{ type: \"ping\", data: \"probe\" }]);\n transport.once(\"packet\", function(msg) {\n if (failed) return;\n if (\"pong\" === msg.type && \"probe\" === msg.data) {\n\n\n self.upgrading = true;\n self.emit(\"upgrading\", transport);\n if (!transport) return;\n Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n\n\n\n self.transport.pause(function() {\n if (failed) return;\n if (\"closed\" === self.readyState) return;\n\n\n\n cleanup();\n\n self.setTransport(transport);\n transport.send([{ type: \"upgrade\" }]);\n self.emit(\"upgrade\", transport);\n transport = null;\n self.upgrading = false;\n self.flush();\n });\n } else {\n\n\n const err = new Error(\"probe error\");\n err.transport = transport.name;\n self.emit(\"upgradeError\", err);\n }\n });\n }\n\n function freezeTransport() {\n if (failed) return;\n\n // Any callback called by transport should be ignored since now\n failed = true;\n\n cleanup();\n\n transport.close();\n transport = null;\n }\n\n // Handle any error that happens while probing\n function onerror(err) {\n const error = new Error(\"probe error: \" + err);\n error.transport = transport.name;\n\n freezeTransport();\n\n\n\n\n self.emit(\"upgradeError\", error);\n }\n\n function onTransportClose() {\n onerror(\"transport closed\");\n }\n\n // When the socket is closed while we're probing\n function onclose() {\n onerror(\"socket closed\");\n }\n\n // When the socket is upgraded while we're probing\n function onupgrade(to) {\n if (transport && to.name !== transport.name) {\n\n\n freezeTransport();\n }\n }\n\n // Remove all listeners on the transport and on self\n function cleanup() {\n transport.removeListener(\"open\", onTransportOpen);\n transport.removeListener(\"error\", onerror);\n transport.removeListener(\"close\", onTransportClose);\n self.removeListener(\"close\", onclose);\n self.removeListener(\"upgrading\", onupgrade);\n }\n\n transport.once(\"open\", onTransportOpen);\n transport.once(\"error\", onerror);\n transport.once(\"close\", onTransportClose);\n\n this.once(\"close\", onclose);\n this.once(\"upgrading\", onupgrade);\n\n transport.open();\n }\n\n /**\n * Called when connection is deemed open.\n *\n * @api public\n */\n onOpen() {\n\n\n this.readyState = \"open\";\n Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n this.emit(\"open\");\n this.flush();\n\n // we check for `readyState` in case an `open`\n // listener already closed the socket\n if (\n \"open\" === this.readyState &&\n this.opts.upgrade &&\n this.transport.pause\n ) {\n\n\n let i = 0;\n const l = this.upgrades.length;\n for (; i < l; i++) {\n this.probe(this.upgrades[i]);\n }\n }\n }\n\n /**\n * Handles a packet.\n *\n * @api private\n */\n onPacket(packet) {\n if (\n \"opening\" === this.readyState ||\n \"open\" === this.readyState ||\n \"closing\" === this.readyState\n ) {\n\n\n\n this.emit(\"packet\", packet);\n\n // Socket is live - any packet counts\n this.emit(\"heartbeat\");\n\n switch (packet.type) {\n case \"open\":\n this.onHandshake(JSON.parse(packet.data));\n break;\n\n case \"ping\":\n this.resetPingTimeout();\n this.sendPacket(\"pong\");\n this.emit(\"pong\");\n break;\n\n case \"error\":\n const err = new Error(\"server error\");\n err.code = packet.data;\n this.onError(err);\n break;\n\n case \"message\":\n this.emit(\"data\", packet.data);\n this.emit(\"message\", packet.data);\n break;\n }\n } else {\n\n\n }\n }\n\n /**\n * Called upon handshake completion.\n *\n * @param {Object} handshake obj\n * @api private\n */\n onHandshake(data) {\n this.emit(\"handshake\", data);\n this.id = data.sid;\n this.transport.query.sid = data.sid;\n this.upgrades = this.filterUpgrades(data.upgrades);\n this.pingInterval = data.pingInterval;\n this.pingTimeout = data.pingTimeout;\n this.onOpen();\n // In case open handler closes socket\n if (\"closed\" === this.readyState) return;\n this.resetPingTimeout();\n }\n\n /**\n * Sets and resets ping timeout timer based on server pings.\n *\n * @api private\n */\n resetPingTimeout() {\n clearTimeout(this.pingTimeoutTimer);\n this.pingTimeoutTimer = setTimeout(() => {\n this.onClose(\"ping timeout\");\n }, this.pingInterval + this.pingTimeout);\n }\n\n /**\n * Called on `drain` event\n *\n * @api private\n */\n onDrain() {\n this.writeBuffer.splice(0, this.prevBufferLen);\n\n // setting prevBufferLen = 0 is very important\n // for example, when upgrading, upgrade packet is sent over,\n // and a nonzero prevBufferLen could cause problems on `drain`\n this.prevBufferLen = 0;\n\n if (0 === this.writeBuffer.length) {\n this.emit(\"drain\");\n } else {\n this.flush();\n }\n }\n\n /**\n * Flush write buffers.\n *\n * @api private\n */\n flush() {\n if (\n \"closed\" !== this.readyState &&\n this.transport.writable &&\n !this.upgrading &&\n this.writeBuffer.length\n ) {\n\n\n this.transport.send(this.writeBuffer);\n // keep track of current length of writeBuffer\n // splice writeBuffer and callbackBuffer on `drain`\n this.prevBufferLen = this.writeBuffer.length;\n this.emit(\"flush\");\n }\n }\n\n /**\n * Sends a message.\n *\n * @param {String} message.\n * @param {Function} callback function.\n * @param {Object} options.\n * @return {Socket} for chaining.\n * @api public\n */\n write(msg, options, fn) {\n this.sendPacket(\"message\", msg, options, fn);\n return this;\n }\n\n send(msg, options, fn) {\n this.sendPacket(\"message\", msg, options, fn);\n return this;\n }\n\n /**\n * Sends a packet.\n *\n * @param {String} packet type.\n * @param {String} data.\n * @param {Object} options.\n * @param {Function} callback function.\n * @api private\n */\n sendPacket(type, data, options, fn) {\n if (\"function\" === typeof data) {\n fn = data;\n data = undefined;\n }\n\n if (\"function\" === typeof options) {\n fn = options;\n options = null;\n }\n\n if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n return;\n }\n\n options = options || {};\n options.compress = false !== options.compress;\n\n const packet = {\n type: type,\n data: data,\n options: options\n };\n this.emit(\"packetCreate\", packet);\n this.writeBuffer.push(packet);\n if (fn) this.once(\"flush\", fn);\n this.flush();\n }\n\n /**\n * Closes the connection.\n *\n * @api private\n */\n close() {\n const self = this;\n\n if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n this.readyState = \"closing\";\n\n if (this.writeBuffer.length) {\n this.once(\"drain\", function() {\n if (this.upgrading) {\n waitForUpgrade();\n } else {\n close();\n }\n });\n } else if (this.upgrading) {\n waitForUpgrade();\n } else {\n close();\n }\n }\n\n function close() {\n self.onClose(\"forced close\");\n\n\n self.transport.close();\n }\n\n function cleanupAndClose() {\n self.removeListener(\"upgrade\", cleanupAndClose);\n self.removeListener(\"upgradeError\", cleanupAndClose);\n close();\n }\n\n function waitForUpgrade() {\n // wait for upgrade to finish since we can't send packets while pausing a transport\n self.once(\"upgrade\", cleanupAndClose);\n self.once(\"upgradeError\", cleanupAndClose);\n }\n\n return this;\n }\n\n /**\n * Called upon transport error\n *\n * @api private\n */\n onError(err) {\n\n\n Socket.priorWebsocketSuccess = false;\n this.emit(\"error\", err);\n this.onClose(\"transport error\", err);\n }\n\n /**\n * Called upon transport close.\n *\n * @api private\n */\n onClose(reason, desc) {\n if (\n \"opening\" === this.readyState ||\n \"open\" === this.readyState ||\n \"closing\" === this.readyState\n ) {\n\n\n const self = this;\n\n // clear timers\n clearTimeout(this.pingIntervalTimer);\n clearTimeout(this.pingTimeoutTimer);\n\n // stop event from firing again for transport\n this.transport.removeAllListeners(\"close\");\n\n // ensure transport won't stay open\n this.transport.close();\n\n // ignore further transport communication\n this.transport.removeAllListeners();\n\n // set ready state\n this.readyState = \"closed\";\n\n // clear session id\n this.id = null;\n\n // emit close event\n this.emit(\"close\", reason, desc);\n\n // clean buffers after, so users can still\n // grab the buffers on `close` event\n self.writeBuffer = [];\n self.prevBufferLen = 0;\n }\n }\n\n /**\n * Filters upgrades, returning only those matching client transports.\n *\n * @param {Array} server upgrades\n * @api private\n *\n */\n filterUpgrades(upgrades) {\n const filteredUpgrades = [];\n let i = 0;\n const j = upgrades.length;\n for (; i < j; i++) {\n if (~this.transports.indexOf(upgrades[i]))\n filteredUpgrades.push(upgrades[i]);\n }\n return filteredUpgrades;\n }\n}\n\nSocket.priorWebsocketSuccess = false;\n\n/**\n * Protocol version.\n *\n * @api public\n */\n\nSocket.protocol = parser.protocol; // this is an int\n\nfunction clone(obj) {\n const o = {};\n for (let i in obj) {\n if (obj.hasOwnProperty(i)) {\n o[i] = obj[i];\n }\n }\n return o;\n}\n\nmodule.exports = Socket;\n","\n/**\n * Module exports.\n *\n * Logic borrowed from Modernizr:\n *\n * - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js\n */\n\ntry {\n module.exports = typeof XMLHttpRequest !== 'undefined' &&\n 'withCredentials' in new XMLHttpRequest();\n} catch (err) {\n // if XMLHttp support is disabled in IE then it will throw\n // when trying to create\n module.exports = false;\n}\n","/* global attachEvent */\n\nconst XMLHttpRequest = require(\"xmlhttprequest-ssl\");\nconst Polling = require(\"./polling\");\nconst Emitter = require(\"component-emitter\");\nconst { pick } = require(\"../util\");\nconst globalThis = require(\"../globalThis\");\n\n\n\n\n/**\n * Empty function\n */\n\nfunction empty() {}\n\nconst hasXHR2 = (function() {\n const XMLHttpRequest = require(\"xmlhttprequest-ssl\");\n const xhr = new XMLHttpRequest({ xdomain: false });\n return null != xhr.responseType;\n})();\n\nclass XHR extends Polling {\n /**\n * XHR Polling constructor.\n *\n * @param {Object} opts\n * @api public\n */\n constructor(opts) {\n super(opts);\n\n if (typeof location !== \"undefined\") {\n const isSSL = \"https:\" === location.protocol;\n let port = location.port;\n\n // some user agents have empty `location.port`\n if (!port) {\n port = isSSL ? 443 : 80;\n }\n\n this.xd =\n (typeof location !== \"undefined\" &&\n opts.hostname !== location.hostname) ||\n port !== opts.port;\n this.xs = opts.secure !== isSSL;\n }\n /**\n * XHR supports binary\n */\n const forceBase64 = opts && opts.forceBase64;\n this.supportsBinary = hasXHR2 && !forceBase64;\n }\n\n /**\n * Creates a request.\n *\n * @param {String} method\n * @api private\n */\n request(opts = {}) {\n Object.assign(opts, { xd: this.xd, xs: this.xs }, this.opts);\n return new Request(this.uri(), opts);\n }\n\n /**\n * Sends data.\n *\n * @param {String} data to send.\n * @param {Function} called upon flush.\n * @api private\n */\n doWrite(data, fn) {\n const req = this.request({\n method: \"POST\",\n data: data\n });\n const self = this;\n req.on(\"success\", fn);\n req.on(\"error\", function(err) {\n self.onError(\"xhr post error\", err);\n });\n }\n\n /**\n * Starts a poll cycle.\n *\n * @api private\n */\n doPoll() {\n\n\n const req = this.request();\n const self = this;\n req.on(\"data\", function(data) {\n self.onData(data);\n });\n req.on(\"error\", function(err) {\n self.onError(\"xhr poll error\", err);\n });\n this.pollXhr = req;\n }\n}\n\nclass Request extends Emitter {\n /**\n * Request constructor\n *\n * @param {Object} options\n * @api public\n */\n constructor(uri, opts) {\n super();\n this.opts = opts;\n\n this.method = opts.method || \"GET\";\n this.uri = uri;\n this.async = false !== opts.async;\n this.data = undefined !== opts.data ? opts.data : null;\n\n this.create();\n }\n\n /**\n * Creates the XHR object and sends the request.\n *\n * @api private\n */\n create() {\n const opts = pick(\n this.opts,\n \"agent\",\n \"enablesXDR\",\n \"pfx\",\n \"key\",\n \"passphrase\",\n \"cert\",\n \"ca\",\n \"ciphers\",\n \"rejectUnauthorized\"\n );\n opts.xdomain = !!this.opts.xd;\n opts.xscheme = !!this.opts.xs;\n\n const xhr = (this.xhr = new XMLHttpRequest(opts));\n const self = this;\n\n try {\n\n\n xhr.open(this.method, this.uri, this.async);\n try {\n if (this.opts.extraHeaders) {\n xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n for (let i in this.opts.extraHeaders) {\n if (this.opts.extraHeaders.hasOwnProperty(i)) {\n xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n }\n }\n }\n } catch (e) {}\n\n if (\"POST\" === this.method) {\n try {\n xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n } catch (e) {}\n }\n\n try {\n xhr.setRequestHeader(\"Accept\", \"*/*\");\n } catch (e) {}\n\n // ie6 check\n if (\"withCredentials\" in xhr) {\n xhr.withCredentials = this.opts.withCredentials;\n }\n\n if (this.opts.requestTimeout) {\n xhr.timeout = this.opts.requestTimeout;\n }\n\n if (this.hasXDR()) {\n xhr.onload = function() {\n self.onLoad();\n };\n xhr.onerror = function() {\n self.onError(xhr.responseText);\n };\n } else {\n xhr.onreadystatechange = function() {\n if (4 !== xhr.readyState) return;\n if (200 === xhr.status || 1223 === xhr.status) {\n self.onLoad();\n } else {\n // make sure the `error` event handler that's user-set\n // does not throw in the same tick and gets caught here\n setTimeout(function() {\n self.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n }, 0);\n }\n };\n }\n\n\n\n xhr.send(this.data);\n } catch (e) {\n // Need to defer since .create() is called directly from the constructor\n // and thus the 'error' event can only be only bound *after* this exception\n // occurs. Therefore, also, we cannot throw here at all.\n setTimeout(function() {\n self.onError(e);\n }, 0);\n return;\n }\n\n if (typeof document !== \"undefined\") {\n this.index = Request.requestsCount++;\n Request.requests[this.index] = this;\n }\n }\n\n /**\n * Called upon successful response.\n *\n * @api private\n */\n onSuccess() {\n this.emit(\"success\");\n this.cleanup();\n }\n\n /**\n * Called if we have data.\n *\n * @api private\n */\n onData(data) {\n this.emit(\"data\", data);\n this.onSuccess();\n }\n\n /**\n * Called upon error.\n *\n * @api private\n */\n onError(err) {\n this.emit(\"error\", err);\n this.cleanup(true);\n }\n\n /**\n * Cleans up house.\n *\n * @api private\n */\n cleanup(fromError) {\n if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n return;\n }\n // xmlhttprequest\n if (this.hasXDR()) {\n this.xhr.onload = this.xhr.onerror = empty;\n } else {\n this.xhr.onreadystatechange = empty;\n }\n\n if (fromError) {\n try {\n this.xhr.abort();\n } catch (e) {}\n }\n\n if (typeof document !== \"undefined\") {\n delete Request.requests[this.index];\n }\n\n this.xhr = null;\n }\n\n /**\n * Called upon load.\n *\n * @api private\n */\n onLoad() {\n const data = this.xhr.responseText;\n if (data !== null) {\n this.onData(data);\n }\n }\n\n /**\n * Check if it has XDomainRequest.\n *\n * @api private\n */\n hasXDR() {\n return typeof XDomainRequest !== \"undefined\" && !this.xs && this.enablesXDR;\n }\n\n /**\n * Aborts the request.\n *\n * @api public\n */\n abort() {\n this.cleanup();\n }\n}\n\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\n\nRequest.requestsCount = 0;\nRequest.requests = {};\n\nif (typeof document !== \"undefined\") {\n if (typeof attachEvent === \"function\") {\n attachEvent(\"onunload\", unloadHandler);\n } else if (typeof addEventListener === \"function\") {\n const terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n addEventListener(terminationEvent, unloadHandler, false);\n }\n}\n\nfunction unloadHandler() {\n for (let i in Request.requests) {\n if (Request.requests.hasOwnProperty(i)) {\n Request.requests[i].abort();\n }\n }\n}\n\nmodule.exports = XHR;\nmodule.exports.Request = Request;\n","const { PACKET_TYPES } = require(\"./commons\");\n\nconst withNativeBlob =\n typeof Blob === \"function\" ||\n (typeof Blob !== \"undefined\" &&\n Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n\n// ArrayBuffer.isView method is not defined in IE10\nconst isView = obj => {\n return typeof ArrayBuffer.isView === \"function\"\n ? ArrayBuffer.isView(obj)\n : obj && obj.buffer instanceof ArrayBuffer;\n};\n\nconst encodePacket = ({ type, data }, supportsBinary, callback) => {\n if (withNativeBlob && data instanceof Blob) {\n if (supportsBinary) {\n return callback(data);\n } else {\n return encodeBlobAsBase64(data, callback);\n }\n } else if (\n withNativeArrayBuffer &&\n (data instanceof ArrayBuffer || isView(data))\n ) {\n if (supportsBinary) {\n return callback(data instanceof ArrayBuffer ? data : data.buffer);\n } else {\n return encodeBlobAsBase64(new Blob([data]), callback);\n }\n }\n // plain string\n return callback(PACKET_TYPES[type] + (data || \"\"));\n};\n\nconst encodeBlobAsBase64 = (data, callback) => {\n const fileReader = new FileReader();\n fileReader.onload = function() {\n const content = fileReader.result.split(\",\")[1];\n callback(\"b\" + content);\n };\n return fileReader.readAsDataURL(data);\n};\n\nmodule.exports = encodePacket;\n","const { PACKET_TYPES_REVERSE, ERROR_PACKET } = require(\"./commons\");\n\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n\nlet base64decoder;\nif (withNativeArrayBuffer) {\n base64decoder = require(\"base64-arraybuffer\");\n}\n\nconst decodePacket = (encodedPacket, binaryType) => {\n if (typeof encodedPacket !== \"string\") {\n return {\n type: \"message\",\n data: mapBinary(encodedPacket, binaryType)\n };\n }\n const type = encodedPacket.charAt(0);\n if (type === \"b\") {\n return {\n type: \"message\",\n data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n };\n }\n const packetType = PACKET_TYPES_REVERSE[type];\n if (!packetType) {\n return ERROR_PACKET;\n }\n return encodedPacket.length > 1\n ? {\n type: PACKET_TYPES_REVERSE[type],\n data: encodedPacket.substring(1)\n }\n : {\n type: PACKET_TYPES_REVERSE[type]\n };\n};\n\nconst decodeBase64Packet = (data, binaryType) => {\n if (base64decoder) {\n const decoded = base64decoder.decode(data);\n return mapBinary(decoded, binaryType);\n } else {\n return { base64: true, data }; // fallback for old browsers\n }\n};\n\nconst mapBinary = (data, binaryType) => {\n switch (binaryType) {\n case \"blob\":\n return data instanceof ArrayBuffer ? new Blob([data]) : data;\n case \"arraybuffer\":\n default:\n return data; // assuming the data is already an ArrayBuffer\n }\n};\n\nmodule.exports = decodePacket;\n","/*\n * base64-arraybuffer\n * https://github.com/niklasvh/base64-arraybuffer\n *\n * Copyright (c) 2012 Niklas von Hertzen\n * Licensed under the MIT license.\n */\n(function(){\n \"use strict\";\n\n var chars = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\";\n\n // Use a lookup table to find the index.\n var lookup = new Uint8Array(256);\n for (var i = 0; i < chars.length; i++) {\n lookup[chars.charCodeAt(i)] = i;\n }\n\n exports.encode = function(arraybuffer) {\n var bytes = new Uint8Array(arraybuffer),\n i, len = bytes.length, base64 = \"\";\n\n for (i = 0; i < len; i+=3) {\n base64 += chars[bytes[i] >> 2];\n base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];\n base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];\n base64 += chars[bytes[i + 2] & 63];\n }\n\n if ((len % 3) === 2) {\n base64 = base64.substring(0, base64.length - 1) + \"=\";\n } else if (len % 3 === 1) {\n base64 = base64.substring(0, base64.length - 2) + \"==\";\n }\n\n return base64;\n };\n\n exports.decode = function(base64) {\n var bufferLength = base64.length * 0.75,\n len = base64.length, i, p = 0,\n encoded1, encoded2, encoded3, encoded4;\n\n if (base64[base64.length - 1] === \"=\") {\n bufferLength--;\n if (base64[base64.length - 2] === \"=\") {\n bufferLength--;\n }\n }\n\n var arraybuffer = new ArrayBuffer(bufferLength),\n bytes = new Uint8Array(arraybuffer);\n\n for (i = 0; i < len; i+=4) {\n encoded1 = lookup[base64.charCodeAt(i)];\n encoded2 = lookup[base64.charCodeAt(i+1)];\n encoded3 = lookup[base64.charCodeAt(i+2)];\n encoded4 = lookup[base64.charCodeAt(i+3)];\n\n bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);\n bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);\n bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);\n }\n\n return arraybuffer;\n };\n})();\n","const Polling = require(\"./polling\");\nconst globalThis = require(\"../globalThis\");\n\nconst rNewline = /\\n/g;\nconst rEscapedNewline = /\\\\n/g;\n\n/**\n * Global JSONP callbacks.\n */\n\nlet callbacks;\n\n/**\n * Noop.\n */\n\nfunction empty() {}\n\nclass JSONPPolling extends Polling {\n /**\n * JSONP Polling constructor.\n *\n * @param {Object} opts.\n * @api public\n */\n constructor(opts) {\n super(opts);\n\n this.query = this.query || {};\n\n // define global callbacks array if not present\n // we do this here (lazily) to avoid unneeded global pollution\n if (!callbacks) {\n // we need to consider multiple engines in the same page\n callbacks = globalThis.___eio = globalThis.___eio || [];\n }\n\n // callback identifier\n this.index = callbacks.length;\n\n // add callback to jsonp global\n const self = this;\n callbacks.push(function(msg) {\n self.onData(msg);\n });\n\n // append to query string\n this.query.j = this.index;\n\n // prevent spurious errors from being emitted when the window is unloaded\n if (typeof addEventListener === \"function\") {\n addEventListener(\n \"beforeunload\",\n function() {\n if (self.script) self.script.onerror = empty;\n },\n false\n );\n }\n }\n\n /**\n * JSONP only supports binary as base64 encoded strings\n */\n get supportsBinary() {\n return false;\n }\n\n /**\n * Closes the socket.\n *\n * @api private\n */\n doClose() {\n if (this.script) {\n this.script.parentNode.removeChild(this.script);\n this.script = null;\n }\n\n if (this.form) {\n this.form.parentNode.removeChild(this.form);\n this.form = null;\n this.iframe = null;\n }\n\n super.doClose();\n }\n\n /**\n * Starts a poll cycle.\n *\n * @api private\n */\n doPoll() {\n const self = this;\n const script = document.createElement(\"script\");\n\n if (this.script) {\n this.script.parentNode.removeChild(this.script);\n this.script = null;\n }\n\n script.async = true;\n script.src = this.uri();\n script.onerror = function(e) {\n self.onError(\"jsonp poll error\", e);\n };\n\n const insertAt = document.getElementsByTagName(\"script\")[0];\n if (insertAt) {\n insertAt.parentNode.insertBefore(script, insertAt);\n } else {\n (document.head || document.body).appendChild(script);\n }\n this.script = script;\n\n const isUAgecko =\n \"undefined\" !== typeof navigator && /gecko/i.test(navigator.userAgent);\n\n if (isUAgecko) {\n setTimeout(function() {\n const iframe = document.createElement(\"iframe\");\n document.body.appendChild(iframe);\n document.body.removeChild(iframe);\n }, 100);\n }\n }\n\n /**\n * Writes with a hidden iframe.\n *\n * @param {String} data to send\n * @param {Function} called upon flush.\n * @api private\n */\n doWrite(data, fn) {\n const self = this;\n let iframe;\n\n if (!this.form) {\n const form = document.createElement(\"form\");\n const area = document.createElement(\"textarea\");\n const id = (this.iframeId = \"eio_iframe_\" + this.index);\n\n form.className = \"socketio\";\n form.style.position = \"absolute\";\n form.style.top = \"-1000px\";\n form.style.left = \"-1000px\";\n form.target = id;\n form.method = \"POST\";\n form.setAttribute(\"accept-charset\", \"utf-8\");\n area.name = \"d\";\n form.appendChild(area);\n document.body.appendChild(form);\n\n this.form = form;\n this.area = area;\n }\n\n this.form.action = this.uri();\n\n function complete() {\n initIframe();\n fn();\n }\n\n function initIframe() {\n if (self.iframe) {\n try {\n self.form.removeChild(self.iframe);\n } catch (e) {\n self.onError(\"jsonp polling iframe removal error\", e);\n }\n }\n\n try {\n // ie6 dynamic iframes with target=\"\" support (thanks Chris Lambacher)\n const html = '<iframe src=\"javascript:0\" name=\"' + self.iframeId + '\">';\n iframe = document.createElement(html);\n } catch (e) {\n iframe = document.createElement(\"iframe\");\n iframe.name = self.iframeId;\n iframe.src = \"javascript:0\";\n }\n\n iframe.id = self.iframeId;\n\n self.form.appendChild(iframe);\n self.iframe = iframe;\n }\n\n initIframe();\n\n // escape \\n to prevent it from being converted into \\r\\n by some UAs\n // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side\n data = data.replace(rEscapedNewline, \"\\\\\\n\");\n this.area.value = data.replace(rNewline, \"\\\\n\");\n\n try {\n this.form.submit();\n } catch (e) {}\n\n if (this.iframe.attachEvent) {\n this.iframe.onreadystatechange = function() {\n if (self.iframe.readyState === \"complete\") {\n complete();\n }\n };\n } else {\n this.iframe.onload = complete;\n }\n }\n}\n\nmodule.exports = JSONPPolling;\n","const Transport = require(\"../transport\");\nconst parser = require(\"engine.io-parser\");\nconst parseqs = require(\"parseqs\");\nconst yeast = require(\"yeast\");\nconst { pick } = require(\"../util\");\nconst {\n WebSocket,\n usingBrowserWebSocket,\n defaultBinaryType\n} = require(\"./websocket-constructor\");\n\n\n\n\n// detect ReactNative environment\nconst isReactNative =\n typeof navigator !== \"undefined\" &&\n typeof navigator.product === \"string\" &&\n navigator.product.toLowerCase() === \"reactnative\";\n\nclass WS extends Transport {\n /**\n * WebSocket transport constructor.\n *\n * @api {Object} connection options\n * @api public\n */\n constructor(opts) {\n super(opts);\n\n this.supportsBinary = !opts.forceBase64;\n }\n\n /**\n * Transport name.\n *\n * @api public\n */\n get name() {\n return \"websocket\";\n }\n\n /**\n * Opens socket.\n *\n * @api private\n */\n doOpen() {\n if (!this.check()) {\n // let probe timeout\n return;\n }\n\n const uri = this.uri();\n const protocols = this.opts.protocols;\n\n // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n const opts = isReactNative\n ? {}\n : pick(\n this.opts,\n \"agent\",\n \"perMessageDeflate\",\n \"pfx\",\n \"key\",\n \"passphrase\",\n \"cert\",\n \"ca\",\n \"ciphers\",\n \"rejectUnauthorized\",\n \"localAddress\"\n );\n\n if (this.opts.extraHeaders) {\n opts.headers = this.opts.extraHeaders;\n }\n\n try {\n this.ws =\n usingBrowserWebSocket && !isReactNative\n ? protocols\n ? new WebSocket(uri, protocols)\n : new WebSocket(uri)\n : new WebSocket(uri, protocols, opts);\n } catch (err) {\n return this.emit(\"error\", err);\n }\n\n this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n\n this.addEventListeners();\n }\n\n /**\n * Adds event listeners to the socket\n *\n * @api private\n */\n addEventListeners() {\n const self = this;\n\n this.ws.onopen = function() {\n self.onOpen();\n };\n this.ws.onclose = function() {\n self.onClose();\n };\n this.ws.onmessage = function(ev) {\n self.onData(ev.data);\n };\n this.ws.onerror = function(e) {\n self.onError(\"websocket error\", e);\n };\n }\n\n /**\n * Writes data to socket.\n *\n * @param {Array} array of packets.\n * @api private\n */\n write(packets) {\n const self = this;\n this.writable = false;\n\n // encodePacket efficient as it uses WS framing\n // no need for encodePayload\n let total = packets.length;\n let i = 0;\n const l = total;\n for (; i < l; i++) {\n (function(packet) {\n parser.encodePacket(packet, self.supportsBinary, function(data) {\n // always create a new object (GH-437)\n const opts = {};\n if (!usingBrowserWebSocket) {\n if (packet.options) {\n opts.compress = packet.options.compress;\n }\n\n if (self.opts.perMessageDeflate) {\n const len =\n \"string\" === typeof data\n ? Buffer.byteLength(data)\n : data.length;\n if (len < self.opts.perMessageDeflate.threshold) {\n opts.compress = false;\n }\n }\n }\n\n // Sometimes the websocket has already been closed but the browser didn't\n // have a chance of informing us about it yet, in that case send will\n // throw an error\n try {\n if (usingBrowserWebSocket) {\n // TypeError is thrown when passing the second argument on Safari\n self.ws.send(data);\n } else {\n self.ws.send(data, opts);\n }\n } catch (e) {\n\n\n }\n\n --total || done();\n });\n })(packets[i]);\n }\n\n function done() {\n self.emit(\"flush\");\n\n // fake drain\n // defer to next tick to allow Socket to clear writeBuffer\n setTimeout(function() {\n self.writable = true;\n self.emit(\"drain\");\n }, 0);\n }\n }\n\n /**\n * Called upon close\n *\n * @api private\n */\n onClose() {\n Transport.prototype.onClose.call(this);\n }\n\n /**\n * Closes socket.\n *\n * @api private\n */\n doClose() {\n if (typeof this.ws !== \"undefined\") {\n this.ws.close();\n }\n }\n\n /**\n * Generates uri for connection.\n *\n * @api private\n */\n uri() {\n let query = this.query || {};\n const schema = this.opts.secure ? \"wss\" : \"ws\";\n let port = \"\";\n\n // avoid port if default for schema\n if (\n this.opts.port &&\n ((\"wss\" === schema && Number(this.opts.port) !== 443) ||\n (\"ws\" === schema && Number(this.opts.port) !== 80))\n ) {\n port = \":\" + this.opts.port;\n }\n\n // append timestamp to URI\n if (this.opts.timestampRequests) {\n query[this.opts.timestampParam] = yeast();\n }\n\n // communicate binary support capabilities\n if (!this.supportsBinary) {\n query.b64 = 1;\n }\n\n query = parseqs.encode(query);\n\n // prepend ? to query\n if (query.length) {\n query = \"?\" + query;\n }\n\n const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n return (\n schema +\n \"://\" +\n (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n port +\n this.opts.path +\n query\n );\n }\n\n /**\n * Feature detection for WebSocket.\n *\n * @return {Boolean} whether this transport is available.\n * @api public\n */\n check() {\n return (\n !!WebSocket &&\n !(\"__initialize\" in WebSocket && this.name === WS.prototype.name)\n );\n }\n}\n\nmodule.exports = WS;\n","const globalThis = require(\"../globalThis\");\n\nmodule.exports = {\n WebSocket: globalThis.WebSocket || globalThis.MozWebSocket,\n usingBrowserWebSocket: true,\n defaultBinaryType: \"arraybuffer\"\n};\n","\"use strict\";\nObject.defineProperty(exports, \"__esModule\", { value: true });\nexports.reconstructPacket = exports.deconstructPacket = void 0;\nconst is_binary_1 = require(\"./is-binary\");\n/**\n * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.\n *\n * @param {Object} packet - socket.io event packet\n * @return {Object} with deconstructed packet and list of buffers\n * @public\n */\nfunction deconstructPacket(packet) {\n const buffers = [];\n const packetData = packet.data;\n const pack = packet;\n pack.data = _deconstructPacket(packetData, buffers);\n pack.attachments = buffers.length; // number of binary 'attachments'\n return { packet: pack, buffers: buffers };\n}\nexports.deconstructPacket = deconstructPacket;\nfunction _deconstructPacket(data, buffers) {\n if (!data)\n return data;\n if (is_binary_1.isBinary(data)) {\n const placeholder = { _placeholder: true, num: buffers.length };\n buffers.push(data);\n return placeholder;\n }\n else if (Array.isArray(data)) {\n const newData = new Array(data.length);\n for (let i = 0; i < data.length; i++) {\n newData[i] = _deconstructPacket(data[i], buffers);\n }\n return newData;\n }\n else if (typeof data === \"object\" && !(data instanceof Date)) {\n const newData = {};\n for (const key in data) {\n if (data.hasOwnProperty(key)) {\n newData[key] = _deconstructPacket(data[key], buffers);\n }\n }\n return newData;\n }\n return data;\n}\n/**\n * Reconstructs a binary packet from its placeholder packet and buffers\n *\n * @param {Object} packet - event packet with placeholders\n * @param {Array} buffers - binary buffers to put in placeholder positions\n * @return {Object} reconstructed packet\n * @public\n */\nfunction reconstructPacket(packet, buffers) {\n packet.data = _reconstructPacket(packet.data, buffers);\n packet.attachments = undefined; // no longer useful\n return packet;\n}\nexports.reconstructPacket = reconstructPacket;\nfunction _reconstructPacket(data, buffers) {\n if (!data)\n return data;\n if (data && data._placeholder) {\n return buffers[data.num]; // appropriate buffer (should be natural order anyway)\n }\n else if (Array.isArray(data)) {\n for (let i = 0; i < data.length; i++) {\n data[i] = _reconstructPacket(data[i], buffers);\n }\n }\n else if (typeof data === \"object\") {\n for (const key in data) {\n if (data.hasOwnProperty(key)) {\n data[key] = _reconstructPacket(data[key], buffers);\n }\n }\n }\n return data;\n}\n","\n/**\n * Expose `Backoff`.\n */\n\nmodule.exports = Backoff;\n\n/**\n * Initialize backoff timer with `opts`.\n *\n * - `min` initial timeout in milliseconds [100]\n * - `max` max timeout [10000]\n * - `jitter` [0]\n * - `factor` [2]\n *\n * @param {Object} opts\n * @api public\n */\n\nfunction Backoff(opts) {\n opts = opts || {};\n this.ms = opts.min || 100;\n this.max = opts.max || 10000;\n this.factor = opts.factor || 2;\n this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;\n this.attempts = 0;\n}\n\n/**\n * Return the backoff duration.\n *\n * @return {Number}\n * @api public\n */\n\nBackoff.prototype.duration = function(){\n var ms = this.ms * Math.pow(this.factor, this.attempts++);\n if (this.jitter) {\n var rand = Math.random();\n var deviation = Math.floor(rand * this.jitter * ms);\n ms = (Math.floor(rand * 10) & 1) == 0 ? ms - deviation : ms + deviation;\n }\n return Math.min(ms, this.max) | 0;\n};\n\n/**\n * Reset the number of attempts.\n *\n * @api public\n */\n\nBackoff.prototype.reset = function(){\n this.attempts = 0;\n};\n\n/**\n * Set the minimum duration\n *\n * @api public\n */\n\nBackoff.prototype.setMin = function(min){\n this.ms = min;\n};\n\n/**\n * Set the maximum duration\n *\n * @api public\n */\n\nBackoff.prototype.setMax = function(max){\n this.max = max;\n};\n\n/**\n * Set the jitter\n *\n * @api public\n */\n\nBackoff.prototype.setJitter = function(jitter){\n this.jitter = jitter;\n};\n\n"],"sourceRoot":""}
|
